Process for the insulation of accumulator plates of different polarities



.May 25 1926. A 1 L. CAILLARD PROCESS FOR THE INSULATION OF ACCUMULATOR PLATES OF DIFFERENT POLARITIES FiledJune 6, 1924 a a m Q z A TTORNEYS Patented May 25, 1926.

UNITED STATES,

. 1. 8 .406 PATENT v OFFICE.

LEONCAILLARD, or Lrvnmmrnnmrr, amen.

' raoca ss roa TEE msuna'rxo'x or accouuna'roa rna'ras or n ronam'rms.

. Application flld June- 8,-

This invention has for its object a process and the corresponding apparatus for the insulation of'accumulator plates of difierent polarities, in order to effectively prevent any I possibility of contact between the positive lates and the negative plates being caused, ythe active material falling from the plate for example.

It has already been proposed, in order to I prevent 'short circuits due specially to the fall of active material from the positive plates, that separating partitions be arranged in different positionsv between the accumulator plates, but .the arrangements used for this purpose are only relatively ef- 'fective for the active material which fallschiefly from the positive plates, can accumulate at the bottoi'n of the vessel and can thus come in contact with the neighbouring negative plates. p The process according to the resent invention removes these inconvemences and consists in entirely enclosing each positive accumulator plate for example in a pro- 2 tecting compartment, which canbe easilytraversed by the electric ions, and the resistance of whosewalls is suflicient tomaintain the active material which may become detached from the positive plate, thereby preventing it from falling to the bottom of the vessel.

In the accompanyin drawing which represents for the sake o a practical example of the invention, a constructional form of 'an accumulator plate:

I Figure 1 is a transverse secti 1lzigure 2 is a perspective view 0 'p' a e.

Forcarrying' the process into effect, all 40 the accumulator plates of the same polarity, for, example the positive plates, which are I more subjected to deterioration, are housed Y .in a compartment 'or cell, whose walls areformed by plates of substance permeable to electric ions as well as to the electrolyte, such for example as thin plates of wood suitably arranged.

' In. the constructional form represented in the drawing, the accumulator plate 1 is covered over on its two faces, with membra-nes 2, 3 of wood of small thickness, which on of a late, this v have been subjected to suitable treatment.

These membranes 2, 3 may either beapplied directly against the accumulator platel, or 5 may be placed ata suitable distance from' said plate. The two membranes 2, '3 are this frame 4 with the addition of ribs such 1924. Serial in. 718,848;

negative and positive plates at a suitable distance apart. In setting up this envelope, the accumulator plate 1 is placed in a mould to vulcanize the caeutchouc while the membranes or screens of Wood 2, 3 of suitabl'e thickness are arranged uponthe two faces of the plate.

. Within grooves of the mould are arranged unvulcanized sheets of ebonite for forming the sides of the frame 4, as well as the stripe which should constitute the ribs 5. .The vulcanization is then effected in any suitable manner so as to rigidly hold the membranes 2, "3 solid with the sheets of ebonite 4 as well as with the ribs 5, while the said sheets 4 are at the same time joined together for forming the frame. Once this vulcanization is effected, the plate 5 is totally enclosed and receives complete protection, preventing, in an absolute manner, any fall of active material. a

' The framing 4 will be traversed by theelectrodesor other means" of junction, of usual form and arrangement. I a

The complete membranes 2, 3 could be re; placed by perforated partitions made oi a substance which is a non-conductor of electricity, as for exam Ie the wood ebonite. These membranes-co d also be replaced by permeable screens,.such for example as textile fabrics or any other substances preferabl offering sufiicient resistance to shocks, an tobending. I

The envelope of the accumulator plate could be constituted in any suitable manner other than that described, the framing being connected .to the membranes in any suitable manner. This connection could also be set up in a removable manner in order to permit of the repair of the accumulator plate.

The membranes 2, 3 could also be omitted, and there could be placed on the accumulator plate 1, either simply the frame 4, or

as 5 vulcanized together. The said ribs could be arranged, either solely on the sides of the frame 4 or on the ends, or on both sides and ends and in the horizontal direction.

The invention can be employed with accumulator plates of any kind of any pattern and for all applications, whatever may be the form and dimensions of the plates.

What I claim is:

1. The herein described process of forming an insulating envelope on an accumulator plate, consisting in vulcanizing the envelope on the plate and simultaneously forming the envelope with the ribs.

2. The herein described process of forming an insulating envelope on an accumulator plate consisting in placing an accumulator plate in 'a grooved mold, applying sheets of permeable material to the sides of the plate, applying a strip of ebonite to the edges of the plates in overlapping engagement with the sheets, placing vulcanized rubber in the grooves of the mold, and vulcanizing the ebonite strip and unvulcanized rubber to the said sheets.

3. The herein described process of forming an insulating envelope on an accumulator plate, consisting in applying sheets of permeable material to the sides of the plate and a frame of ebonite or hardened caoutmsaeoe chouc to the edge of the plate in overlapping engagement with the said sheets and vulcanizin the ebonite or hardened caoutchouc rame.

4. The herein described process of forming an insulating envelope on an accumw lator plate, consisting in applying thin sheets of wood to the sides of the plate and a frame of ebonite or hardened caoutchouc to the edge of the frame in overlapping engagement with the sheets, placing the enclosed plate in a mold and vulcanizing the ebonite or hardened caoutchouc frame in the mold.

5. The herein described process of forming an insulating envelope on an accumulator plate, consisting in applying thin sheets of wood to the sides of the plate and a frame of ebonite or hardened caoutchouc to the edge of the frame in overlapping engagement with the said sheets, placing the same in a mold containing strips of ebonite or hardened caoutchouc disposed to extend across the sheets, and vulcanizing the frame and strips in the mold.

In testimony whereof I have hereunto set my hand.

LEON CAHJLARD. 

